Manuscript, 'Additional observations on the osteology of the iguanodon and hylæosaurus' by Gideon Algernon Mantell Paper also includes a section titled 'Notes on the vertebral column of the iguanodon' by A G [Alexander Gordon] Melville. Subject: Palaeontology Published in Philosophical Transactions as 'Additional observations on the osteology of the Iguanodon and Hylæosaurus'. Written by Mantell at 19 Chester Square, Pimlico [London]. Received by the Royal Society on 15 January 1849. Read 8 March 1849. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 5, 1851. 15 January 1849